Answer pleas my sir is asking and i dont know to answer

Which equation represents the partial sum of the geometric series?

Svetlana's hair is 4 4 centimeters ( cm cm) long. her hair grows 1 . 5 cm 1.5cm per month. svetlana wants her hair to be less than 1 6 cm 16cm long. write an inequality to determine the number of months, m m, svetlana can allow her hair to grow so that it is less than 1 6 cm 16cm long.

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle